✨ Add MailerLite Node & Trigger (#1067)

* ✨ MailerLite Node & Trigger

* ⚡ Set correct name to node and trigger

packages/nodes-base/nodes/MailerLite/MailerLiteTrigger.node.ts

@@ -0,0 +1,189 @@
+import {
+	IHookFunctions,
+	IWebhookFunctions,
+} from 'n8n-core';
+
+import {
+	IDataObject,
+	INodeType,
+	INodeTypeDescription,
+	IWebhookResponseData,
+} from 'n8n-workflow';
+
+import {
+	mailerliteApiRequest,
+} from './GenericFunctions';
+
+export class MailerLiteTrigger implements INodeType {
+	description: INodeTypeDescription = {
+		displayName: 'MailerLite Trigger',
+		name: 'mailerLiteTrigger',
+		icon: 'file:mailerLite.png',
+		group: ['trigger'],
+		version: 1,
+		description: 'Starts the workflow when a MailerLite events occurs.',
+		defaults: {
+			name: 'MailerLite Trigger',
+			color: '#58be72',
+		},
+		inputs: [],
+		outputs: ['main'],
+		credentials: [
+			{
+				name: 'mailerLiteApi',
+				required: true,
+			},
+		],
+		webhooks: [
+			{
+				name: 'default',
+				httpMethod: 'POST',
+				responseMode: 'onReceived',
+				path: 'webhook',
+			},
+		],
+		properties: [
+			{
+				displayName: 'Event',
+				name: 'event',
+				type: 'options',
+				options: [
+					{
+						name: 'Campaign Sent',
+						value: 'campaign.sent',
+						description: `Fired when campaign is sent.`,
+					},
+					{
+						name: 'Subscriber Added to Group',
+						value: 'subscriber.add_to_group',
+						description: `Fired when a subscriber is added to a group.`,
+					},
+					{
+						name: 'Subscriber Added Throught Webform',
+						value: 'subscriber.added_through_webform',
+						description: `Fired when a subscriber is added though a form.`,
+					},
+					{
+						name: 'Subscriber Autonomation Completed',
+						value: 'subscriber.automation_complete',
+						description: `Fired when subscriber finishes automation.`,
+					},
+					{
+						name: 'Subscriber Autonomation Triggered',
+						value: 'subscriber.automation_triggered',
+						description: `Fired when subscriber starts automation.`,
+					},
+					{
+						name: 'Subscriber Bounced',
+						value: 'subscriber.bounced',
+						description: `Fired when an email address bounces.`,
+					},
+					{
+						name: 'Subscriber Created',
+						value: 'subscriber.create',
+						description: 'Fired when a new subscriber is added to an account.',
+					},
+					{
+						name: 'Subscriber Complained',
+						value: 'subscriber.complaint',
+						description: `Fired when subscriber marks a campaign as a spam.`,
+					},
+					{
+						name: 'Subscriber Removed from Group',
+						value: 'subscriber.remove_from_group',
+						description: `Fired when a subscriber is removed from a group.`,
+					},
+					{
+						name: 'Subscriber Unsubscribe',
+						value: 'subscriber.unsubscribe',
+						description: `Fired when a subscriber becomes unsubscribed.`,
+					},
+					{
+						name: 'Subscriber Updated',
+						value: 'subscriber.update',
+						description: `Fired when any of the subscriber's custom fields are updated.`,
+					},
+				],
+				required: true,
+				default: [],
+				description: 'The events to listen to.',
+			},
+		],
+	};
+
+	// @ts-ignore (because of request)
+	webhookMethods = {
+		default: {
+			async checkExists(this: IHookFunctions): Promise<boolean> {
+				const webhookUrl = this.getNodeWebhookUrl('default');
+				const webhookData = this.getWorkflowStaticData('node');
+				const event = this.getNodeParameter('event') as string;
+				// Check all the webhooks which exist already if it is identical to the
+				// one that is supposed to get created.
+				const endpoint = '/webhooks';
+				const { webhooks } = await mailerliteApiRequest.call(this, 'GET', endpoint, {});
+				for (const webhook of webhooks) {
+					if (webhook.url === webhookUrl &&
+						webhook.event === event) {
+						// Set webhook-id to be sure that it can be deleted
+						webhookData.webhookId = webhook.id as string;
+						return true;
+					}
+				}
+				return false;
+			},
+			async create(this: IHookFunctions): Promise<boolean> {
+				const webhookData = this.getWorkflowStaticData('node');
+				const webhookUrl = this.getNodeWebhookUrl('default');
+				const event = this.getNodeParameter('event') as string;
+
+				const endpoint = '/webhooks';
+
+				const body = {
+					url: webhookUrl,
+					event,
+				};
+
+				const responseData = await mailerliteApiRequest.call(this, 'POST', endpoint, body);
+
+				if (responseData.id === undefined) {
+					// Required data is missing so was not successful
+					return false;
+				}
+
+				webhookData.webhookId = responseData.id as string;
+				return true;
+			},
+			async delete(this: IHookFunctions): Promise<boolean> {
+				const webhookData = this.getWorkflowStaticData('node');
+				if (webhookData.webhookId !== undefined) {
+
+					const endpoint = `/webhooks/${webhookData.webhookId}`;
+
+					try {
+						await mailerliteApiRequest.call(this, 'DELETE', endpoint);
+					} catch (e) {
+						return false;
+					}
+
+					// Remove from the static workflow data so that it is clear
+					// that no webhooks are registred anymore
+					delete webhookData.webhookId;
+				}
+				return true;
+			},
+		},
+	};
+
+	async webhook(this: IWebhookFunctions): Promise<IWebhookResponseData> {
+		const body = this.getBodyData() as IDataObject;
+
+		const events = body.events as IDataObject[];
+
+		return {
+			workflowData: [
+				this.helpers.returnJsonArray(events)
+			],
+		};
+	}
+}